Figure1. The sequence of cyclic process
The cyclic process contains four steps namely adsorption, heating, evacuation and cooling with total time of 8 hr’s and 45 minutes. Briefly, the polluted air passes through horizontal bed and VOCs are adsorbed on activated carbon surfaces and purified air is released into atmosphere. After adsorption stage, steam is utilized at 120°C to desorb VOC and then hot air evacuates/purges the adsorption bed from condensate water. The regenerated gas (air, steam, condensate water and VOCs) are subjected to cooler for controlling its temperature. The remained gas is released into atmosphere and VOCs are now presented in liquid phase and they undergo further treatment while the adsorption bed is finally cooled via cold air.